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                矩形压缩                </h1>
                <p>时间限制：10s&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;  空间限制：128MB</p>			</div>
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                                <h3>题目描述</h3><p><h3 style="margin-top: 0pt; margin-bottom: 0pt"><span style="font-weight: normal; font-size: 12pt; font-family: '黑体'; mso-spacerun: 'yes'"><o:p></o:p></span></h3>
<p class="p0" style="margin-top: 0pt; margin-bottom: 0pt; line-height: 150%"><span style="font-size: 12pt; font-family: '宋体'; mso-spacerun: 'yes'">平面上给出<font face="Times New Roman">N</font><font face="宋体">个矩形，定义平面内的一个矩形是</font><font face="Times New Roman">cool</font><font face="宋体">的，当且仅当这个矩形的四边完全在给出</font><font face="Times New Roman">N</font><font face="宋体">个矩形的边界上（边界相互重合）。现在你想取</font><font face="Times New Roman">N</font><font face="宋体">个</font><font face="Times New Roman">cool</font><font face="宋体">矩形来一一代表这</font><font face="Times New Roman">N</font><font face="宋体">个矩形。</font></span><span style="font-size: 12pt; font-family: '宋体'; mso-spacerun: 'yes'"><o:p></o:p></span></p>
<p class="p0" style="margin-top: 0pt; margin-bottom: 0pt; line-height: 150%"><span style="font-size: 12pt; font-family: '宋体'; mso-spacerun: 'yes'">假如你要用一个<font face="Times New Roman">cool</font><font face="宋体">矩形来代表矩形</font><font face="Times New Roman">I</font><font face="宋体">，那么必须满足这个</font><font face="Times New Roman">cool</font><font face="宋体">矩形完全在</font><font face="Times New Roman">I</font><font face="宋体">之内；要求一个</font><font face="Times New Roman">cool</font><font face="宋体">矩形只能代表一个矩形，并且你选出的代表这</font><font face="Times New Roman">N</font><font face="宋体">个矩形的</font><font face="Times New Roman">N</font><font face="宋体">个</font><font face="Times New Roman">cool</font><font face="宋体">矩形之间，两两不覆盖（边界可以重叠）。</font></span><span style="font-size: 12pt; font-family: '宋体'; mso-spacerun: 'yes'"><o:p></o:p></span></p>
<p class="p0" style="margin-top: 0pt; margin-bottom: 0pt; line-height: 150%"><span style="font-size: 12pt; font-family: '宋体'; mso-spacerun: 'yes'">问你选出的<font face="Times New Roman">N</font><font face="宋体">个</font><font face="Times New Roman">cool</font><font face="宋体">矩形的最小面积和，或者返回</font><font face="Times New Roman">-1</font><font face="宋体">，表示无解</font></span><span style="font-size: 12pt; font-family: '宋体'; mso-spacerun: 'yes'"><o:p></o:p></span></p>
<p class="p0" style="margin-top: 0pt; margin-bottom: 0pt"><span style="font-size: 12pt; font-family: '宋体'; mso-spacerun: 'yes'"><o:p></o:p></span></p>
<!--EndFragment--></p><hr/><h3>输入格式</h3><p><p class="p0" style="margin-top: 0pt; margin-bottom: 0pt"><span style="font-size: 12pt; font-family: '宋体'; mso-spacerun: 'yes'">输入文件第一行括一个数字<font face="Times New Roman">N</font><font face="宋体">，</font></span><span style="font-size: 12pt; font-family: '宋体'; mso-spacerun: 'yes'"><o:p></o:p></span></p>
<p class="p0" style="margin-top: 0pt; margin-bottom: 0pt"><span style="font-size: 12pt; font-family: '宋体'; mso-spacerun: 'yes'">接下来<font face="Times New Roman">4</font><font face="宋体">行</font><font face="Times New Roman">N</font><font face="宋体">列，每列依次为</font><font face="Times New Roman">4</font><font face="宋体">个数字（</font><font face="Times New Roman">x1</font><font face="宋体">，</font><font face="Times New Roman">y1</font><font face="宋体">），（</font><font face="Times New Roman">x2</font><font face="宋体">，</font><font face="Times New Roman">y2</font><font face="宋体">）表示一个矩形的对顶角坐标。</font></span><span style="font-size: 12pt; font-family: '宋体'; mso-spacerun: 'yes'"><o:p></o:p></span></p>
<p class="p0" style="margin-top: 0pt; margin-bottom: 0pt"><span style="font-size: 12pt; font-family: '宋体'; mso-spacerun: 'yes'"><o:p></o:p></span></p></p><hr/><h3>输出格式</h3><p><p class="p0" style="margin-top: 0pt; margin-bottom: 0pt"><span style="font-size: 12pt; font-family: '宋体'; mso-spacerun: 'yes'">输出最小面积，或者<font face="Times New Roman">-1.</font></span><span style="font-size: 12pt; font-family: '宋体'; mso-spacerun: 'yes'"><o:p></o:p></span></p>
<h3 style="margin-top: 0pt; margin-bottom: 0pt"><span style="font-size: 12pt; font-family: '宋体'; mso-spacerun: 'yes'"><o:p></o:p></span></h3></p><hr/><h3>样例输入</h3><pre>【样例输入1】
2

1 0

1 2

3 4

4 3


【样例输入2】
2

0 1

0 1

2 3

2 3

</pre><hr/><h3>样例输出</h3><pre>【样例输出1】
3

【样例输出2】
-1


</pre><hr/><h3>提示</h3><p><p><br />
对于100%的数据，N &le;30 , |X|，|Y|&le;10000<br />
</p></p><hr/><h3>题目来源</h3><p>2010福建集训</p>
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